add more controllers and fix tests

app/Http/Requests/PurchaseOrders/PurchaseOrderIndexRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Requests\PurchaseOrders;
+
+use App\Http\Requests\ApiFormRequest;
+
+class PurchaseOrderIndexRequest extends ApiFormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'q' => ['nullable', 'string', 'max:100'],
+        ];
+    }
+}

app/Http/Requests/PurchaseOrders/PurchaseOrderReceiveRequest.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Requests\PurchaseOrders;
+
+use App\Http\Requests\ApiFormRequest;
+
+class PurchaseOrderReceiveRequest extends ApiFormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'items' => ['required', 'array', 'min:1'],
+            'items.*.id' => ['required', 'integer', 'min:1'],
+            'items.*.quantity' => ['required', 'integer', 'min:1'],
+        ];
+    }
+}

app/Http/Requests/PurchaseOrders/PurchaseOrderStoreRequest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Requests\PurchaseOrders;
+
+use App\Http\Requests\ApiFormRequest;
+use App\Models\PurchaseOrder;
+
+class PurchaseOrderStoreRequest extends ApiFormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'po_number' => ['required', 'string', 'max:60'],
+            'supplier_id' => ['required', 'integer', 'min:1', 'exists:suppliers,id'],
+            'status' => ['nullable', 'string', 'in:' . implode(',', PurchaseOrder::allowedStatuses())],
+            'order_date' => ['nullable', 'date'],
+            'expected_date' => ['nullable', 'date', 'after_or_equal:order_date'],
+            'notes' => ['nullable', 'string', 'max:5000'],
+            'items' => ['required', 'array', 'min:1'],
+            'items.*.supply_id' => ['required', 'integer', 'min:1', 'exists:supplies,id'],
+            'items.*.description' => ['nullable', 'string', 'max:1000'],
+            'items.*.quantity' => ['required', 'integer', 'min:1'],
+            'items.*.unit_cost' => ['required', 'numeric', 'min:0'],
+        ];
+    }
+}